%0 Journal Article
%T Chemical forms and transformations of Pb, Cu and Cd in agricultural soils of Changjiang and Zhujiang deltas<br>长三角和珠三角农业土壤中铅、铜、镉的化学形态与转化
%A FANG Li-Ping
%A ZHANG Ming-Kui
%A CHEN Mei-Na
%A HUANG Chang-Yong
%A <br>方利平
%A 章明奎
%A 陈美娜
%A 黄昌勇
%J 中国生态农业学报
%D 2007
%I 
%X The transformation processes of Pb,Cu and Cd in ten agricultural soils from Changjiang and Zhujiang deltas were characterized and the effect of Cd,Cu and Pb loads on their chemical forms in the soil studied.Results show that a major fraction of heavy metals in unpolluted soils is in residual form.The proportion of extractable fraction of the heavy metals varies with soil type,but follows a general order of Cd>Cu>Pb.With increasing loads of heavy metals in the soils,the proportion of exchangeable form of the metals increases while that in residual form decreases,leading increased availability and impact of the metals on the environment.When heavy metals are added in low levels,the metals are preferentially transformed into oxides and organic matter fraction bonds.However,the higher proportion of metals leads to exchangeable and carbonate fraction bond transformation.The proportion of exchangeable Pb,Cu and Cd fractions in the soil increase with decreasing pH.
%K Changjiang delta
%K Zhujiang delta
%K Agricultural soil
%K Heavy metal
%K Form
%K Transform<br>长三角
%K 珠三角
%K 农业土壤
%K 重金属
%K 形态
%K 转化
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=AB3ABF502E2E1FF39F0E3B80164C9031&aid=4B033678BEA6D17C&yid=A732AF04DDA03BB3&vid=23CCDDCD68FFCC2F&iid=E158A972A605785F&sid=7C3A4C1EE6A45749&eid=2001E0D53B7B80EC&journal_id=1671-3990&journal_name=中国生态农业学报&referenced_num=5&reference_num=2